Systems and methods for hinge couplings

ABSTRACT

A coupling for coupling pipe segments ( 2,4 ). The coupling includes a first housing component ( 12 ), a second housing component ( 14 ), and a fastener coupling the first and second components together. The fastener ( 22 ) has an aligned configuration defining an axis of alignment such that first and second housing components are in a closed configuration to define a central axis of the coupling. The fastener has a skewed configuration to define a pivot axis of the fastener such that the first and second housing components are in an open configuration. The pivot axis is substantially parallel to the central axis and substantially perpendicular to the axis of alignment.

PRIORITY DATA & INCORPORATION BY REFERENCE

This international application claims the benefit of priority to U.S.Provisional Application No. 61/255,351, filed Oct. 27, 2009, entitled“Systems and Methods for Hinge Couplings” and which is incorporated byreference in its entirety.

TECHNICAL FIELD

This invention relates generally to pipe fittings and more specificallydevices and methods for coupling fluid conveying piping or tubing.

SUMMARY OF THE INVENTION

Provided are preferred systems and methods for a hinged coupling. Thepreferred coupling for coupling two pipe segments together includes afirst housing component having a first end, a second end, and an arcuatesurface extending between the first and second ends of the firstcomponent. A second housing component having a first end, a second end,and an arcuate surface extends between the first and second ends of thefirst component. Each of the first ends of the first and second housingcomponents having a through hole and a fastener disposed within thethrough holes. The preferred fastener has a first element and a secondelement to define a first configuration and a second configuration ofthe fastener. The first configuration of the fastener includes the firstand second elements of the fastener being substantially aligned suchthat the through holes of the first ends of the first and secondcomponents are substantially aligned so as to define an axis ofalignment extending through the through holes. The second configurationof the fastener comprises the first and second elements being skewedwith respect to one another about a pivot axis that extendssubstantially perpendicularly to the axis of alignment.

A method is provided for assembling a pipe coupling that includespivoting about a pivot axis a first fastener element disposed in a firstend of a first housing component of the coupling relative to a secondfastener element disposed in a first end of a second housing componentof the coupling such that the first and second elements are disposedalong a linear axis that is substantially perpendicular to the pivotaxis so to bring interior surfaces of the first and second housingcomponents opposed to one another to define a central axis of thecoupling that runs substantially parallel to the pivot axis. The methodfurther includes securing a second end of the first housing component tothe second end of the second housing component.

In another preferred embodiment of a coupling for coupling pipesegments, the coupling includes a first housing component, a secondhousing component, and a fastener coupling the first and secondcomponents together. The fastener has a first element and a secondelement defining an aligned configuration including an axis of alignmentsuch that first and second housing components are in a closedconfiguration so as to define a central axis of the coupling, the firstand second elements of the fastener having a skewed configuration todefine a pivot axis of the fastener such that the first and secondhousing components are in an open configuration. The pivot axis issubstantially parallel to the central axis and substantiallyperpendicular to the axis of alignment.

In another preferred embodiment, a coupling for coupling pipe segmentsincludes a first housing component and a second housing component. Thefirst and second housing components have an open configuration and aclosed configuration to define a central axis of the coupling. Afastener couples the first and second components together, in which thefastener has a first element engaged with the first housing componentalong a first engagement axis and a second element engaged with thesecond housing component along a second engagement axis. The firstelement is coupled to the second element such that the first and secondelements of the fastener pivot with respect to one another about a pivotaxis that is perpendicular to a plane defined by at least one of thefirst and second engagement axes. The pivot axis is substantiallyparallel to the central axis of the coupling and defines the pivot axisabout which the first and second housing components pivot relative toone another between the open and closed configuration.

In one preferred embodiment of a coupling, the coupling includes a firsthousing component having a first through hole and a second housingcomponent having a second through hole. A fastener having a firstfastener element is engaged with the first housing component and asecond fastener element engaged with the second housing component, thefastener coupling the first and second components together so that thefirst and second housing components pivot with respect to one another.Preferably the fastener has a cast fit within the through holes.

In yet another embodiment, a fastener is provided that includes a firstelement and a second element, each of the first and second elementshaving an enlarged head portion and a shank portion depending from thehead portion along a longitudinal axis. The head portion of each of thefirst and second elements including a through hole to define a pivotaxis. A pin disposed in the through holes of each head portion of thefastener to couple the first element to the second element such that thehead portions of the first and second elements pivot with respect to oneanother about the axis.

BRIEF DESCRIPTIONS OF THE DRAWINGS

The accompanying drawings, which are incorporated herein and constitutepart of this specification, illustrate exemplary embodiments of theinvention, and, together with the description given above, serve toexplain the features of the invention.

FIG. 1 is a perspective view of a preferred coupling.

FIG. 2 is a partial cross-sectional view of the coupling of FIG. 1

FIG. 3A is a preferred embodiment of a fastener for use in the couplingin FIG. 1.

FIG. 3B is a perspective view of the fastener of FIG. 3A.

FIG. 3C is a perspective view of an element in the fastener of FIG. 3A.

FIG. 3D is an exploded view of the fastener of FIG. 3A.

FIG. 4A is a perspective view of another preferred coupling.

FIG. 5A is an open configuration view of a preferred coupling.

FIG. 5B is a perspective view of a preferred coupling in a closedconfiguration.

FIG. 6A is a plan view of a preferred bolt pad extension of a couplinghousing component.

FIG. 6B is an elevation view of the preferred bolt pad extension of FIG.6A.

FIG. 6C is a plan view of another preferred bolt pad extension of acoupling housing component.

FIG. 7A is a preferred coupling in an open assembly configuration.

FIG. 7B is the preferred coupling in FIG. 7A in a closed configuration.

FIG. 8A is another preferred coupling in an opened configuration.

FIG. 8B is the coupling of FIG. 8A in a closed configuration.

FIG. 9A is a partial cross-sectional view of preferred coupling assemblyin a pipe joint using C shaped gasket.

FIG. 9B is a partial cross-sectional view of preferred coupling assemblyin a pipe joint using a Tri-seal gasket.

FIG. 10A is a partial uncompressed schematic view of a preferredcoupling housing and gasket arrangement.

FIG. 10B is a compressed view of the arrangement of FIG. 10A.

DETAILED DESCRIPTION

Shown in FIG. 1 is a preferred embodiment of a hinged coupling 10secured about two preferably grooved pipe segments 2, 4 so as to couplethe pipe segments 2, 4 together along a pipe axis X-X. The preferredcoupling includes two housing components 12, 14 which surround a gasket(hidden) to form a fluid tight seal about the end of the pipe segments2, 4. More specifically, the preferred coupling 10 includes an upperhousing 12 and a lower housing 14 each of which is preferablydimensioned to cradle and house approximately one-half of the pipeassembly. Alternatively, the coupling 10 could include more than twohousing components provided adjacent components could be coupledtogether in a hinged arrangement as described herein.

The coupling 10 includes a coupled end 16 and a preferably diametricallyopposed securement end 18. The coupling 10 is preferably preassembledfor the user such that at the coupled end 16, the upper housing 12 iscoupled to the lower housing 14 by the manufacturer before delivery tothe end user. The housing components 12, 14 additionally pivot withrespect to one another about a pivot axis P-P located at the coupled end16. Accordingly, a user can place the coupling 10 in an openconfiguration, as seen for example in FIG. 2, locate the lower housingcomponent 14 about the ends of the pipe segments 2,4 and pivot the upperhousing 12 with respect to the lower housing component 14 so as toenclose the ends of the pipe segment therebetween in the closedconfiguration of FIG. 1. At the securement end 18, the housingcomponents 12, 14 are secured together such that the housing components12, 14 cannot pivot with respect to one another and a fluid tight sealis formed about the pipe end segments 2, 4.

Shown in FIG. 2 is the coupling 10 in a partially cross-sectional view.In this embodiment, each of the lower and upper housing components 12,14 are similarly configured. More specifically, the upper housingcomponent 12 includes a first end 16 a, a second end 18 a with apreferably substantially arcuate segment 12 a extending between thefirst and second ends 16 a, 18 a. Similarly, the lower housing component14 includes a first end 16 b, a second end 18 b, with a preferablyarcuate segment 14 a extending between the first and second ends 16 a,18 a. With the housing components in their closed configuration, thearcuate segments are opposed to define a center axis C-C of the coupling10. Each of the arcuate segments 12 a, 14 a have an interior surface 12b, 14 b defining a gasket cavity for engaging and housing a gasket seal.Each of the arcuate segments 12 a, 14 a define the outer peripheralsurface segment 12 c, 14 c of the arcuate segments. Preferably, theperipheral surfaces 12 c, 14 c of the housing components together definean arcuate to substantially circular profile, but other geometricprofiles are possible such as polygonal with multiple linear lines.

Each of the first end 16 a, 16 b and the second end 18 a, 18 b of thefirst and second housing components 12, 14 is preferably defined by abolt pad extension having a recess and more preferably a through hole 20for receipt of one end of a fastener to couple the housing componentstogether at each of the coupling end 16 and securement end 18. Shown inFIG. 2 is a preferred pivot fastener 22 engaged or disposed within thethrough holes 20 of the bolt pads at the first ends 16 a, 16 b of theupper and lower housing components 12, 14. In addition to coupling thehousing components 12, 14 together, the pivot fastener 22 provides forrelative pivoting motion between the upper and lower housing components12, 14 about a pivot axis P that preferably runs parallel to the centralaxis C of the coupling 10. Because the housing components 12, 14 in thisembodiment are identical and preferably symmetrical, the preferred pivotfastener 22 can be installed in either of the two ends 16, 18 of thecoupling 10 such that either end of the coupling can serve as thecoupling end 16 and the opposite end could serve as the securement end18. Preferably disposed within the through holes 20 of the second ends18 a, 18 b of the housing components 12, 14 would be another fastener,preferably a fixed straight bolt secured by a nut (not shown) in orderto maintain the coupling 10 in the closed configuration.

Shown in FIGS. 3A and 3B is a preferred pivot fastener 22′. Thepreferred pivot fastener 22′ preferably includes a first element 22′aand a second element 22′b coupled or engaged with the first element 22′asuch that the elements 22′a, 22′b can pivot with respect to one anotherto define two or more configurations. For example, shown in FIG. 3A arethe first and second elements 22′a, 22′b in a first configuration inwhich the elements 22′a, 22′b are substantially axially aligned alongaxis Y-Y, and shown in FIG. 3 b the elements 22′a, 22′b are pivotedrelative to one another such that first element 22′a extending alongaxis YA-YA is skewed with respect to the second element 22′b extendingalong axis YB-YB.

The first and second elements 22′a, 22′b are preferably substantiallyidentical. Shown in FIG. 3C is a preferred element 22′a. Each of theelements 22′a, 22′b of the fastener have a preferably enlarged headportion 24 a and a shank portion 26 a depending from the head portion 24a along the longitudinal axis YA-YA of the element 22′a. The headportions 24 a, 24 b preferably engage or cooperatively operate with oneanother to define the pivoting relationship between the first and secondelements 22′a, 22′b. In one particular preferred embodiment, the headportion 24 a includes a first planar bearing surface 24 aa located in aplane that includes the central longitudinal axis of the element 22′a.The head portion 24 a further preferably includes a second planarshoulder surface 24 ab that extends perpendicular to the first planarbearing surface 24 aa. Transitioning from the enlarged head portion 24to the preferably narrower shank portion 26 a of the elements 22′a is apreferred frustroconical transition portion 24 ac. The transitionportion 24 ac can define an alternate geometry such as for example,circular cylindrical or a step transition from the head portion 24 a tothe shank portion. The shank portion is 26 a is preferably threaded forsecuring the fastener 22′ within the bolt pad ends 16, 18 of thecoupling housing components 12, 14.

Shown in FIG. 3D is an exploded assembly view of the preferred pivotfastener 22′. In the assembly, the planar bearing surfaces 24 aa, 24 baof the elements 22′a, 22′b engage one another to define at least a lineof contact in the plane that includes the central longitudinal axis ofthe pivot axis fastener. To secure the two elements together, thepreferred fastener 22′ includes a pin element 28 that is disposed withinthrough holes 24 ad, 24 bd formed in each of the head portions 24 a, 24b of the elements 22′a, 22′b to define a pin axis P′-P′. The throughholes 24′ad, 24′bd preferably extend orthogonally through the firstplanar bearing surfaces 24 aa, 24 ba in each element 22′a, 22′b. Theelements 22′a, 22′b rotate or pivot with respect to one another aboutthe pin 28 and its axis P′-P′. Referring again to FIG. 3A, the assembledpreferred pivot fastener 22′ includes two preferably threaded ends 26 a,26 b that are opposed about an enlarged central portion 24 a, 24 b alongthe longitudinal axis Y-Y in the axially aligned configuration of thepivot fastener 22′. The central portion 24 a, 24 b preferably defines asubstantially circular cylindrical outer surface geometry.Alternatively, the central portion 24 a, 24 b could be rectangularcylindrical or cubical. The pin 28 preferably defines an axial lengththat is greater than the width of the central portion 24 a, 24 b suchthat the ends of the pin 28 protrude beyond the through hole openings 24ad, 24 bd of the respective head portions 24 a, 24 b of the elements22′a, 22′b. Alternatively, the pin 28 could be integrally formed on oneelement 22′a to be received in a through hole or recess formed on theother element 22′b. Further in the alternative, the each of the elements22′a, 22′b can be formed so as to have corresponding structures thatengage and cooperate with one another such that the elements 22′a, 22′bcan pivot with respect to one another in a manner as described herein.

As described above, the fastener 22 is preferably secured within thethrough holes 20 of the bolt pads formed at one of the ends 16, 18 ofthe housing components 12, 14 to provide the coupling 10 with a housingin which the components 12, 14 are coupled together at one end and yetpivot with respect to one another about an axis P-P. Shown in FIG. 4A isanother view of the preferred coupling 10 assembly in an openconfiguration with the preferred the pivot fastener 22′ secured at thecoupling end 16. Each end of the preferred fastener pivot 22′ is securedwithin the through hole 20 of the bolt pad extensions 16 a, 16 b of therespective upper and lower housing components 12, 14. To secure thefastener 22′, a nut 29 is disposed about the threaded shank 26 a, 26 bof each element 22′a, 22′b of the fastener 22′. With the fastener 22′installed, the central portion 24 of the fastener is located between thehousing components 12, 14 such that the pin 28 pivot and its axis of theP′-P′ is disposed parallel to the central axis C-C of the coupling 10 tothereby define the pivot axis P-P for the coupling assembly.

With the fastener 22′ properly located and disposed within the throughholes 20 of the bolt pad extensions end 16 a, 16 b, the housingcomponents can pivot with respect to one another about the pivot axisP-P to go from the open configuration, as shown for example in FIG. 5Ato the closed configuration shown in FIG. 5B. In the closedconfiguration of the coupling 10, the fastener 22′ is preferablydisposed such that the through holes 20 are substantially axiallyaligned, and in the open configuration, the fastener 22′ is disposedsuch that the through holes are skewed with respect to one another. Therange of angles through which the housing component may pivot withrespect to one another is preferably only limited by the angular rangeover which the two elements 22′a, 22′b can pivot with respect to oneanother and the interference between the housing components over thatangular range. Referring back to FIG. 3B, the first element 22′a has apreferred angular range of rotation about 180° degrees and morepreferably 210° degrees about the fastener pivot axis P′-P′ relative tothe second element 22′b. Accordingly, the upper component 12 preferablypivots through a corresponding range of angular rotation about the pivotaxis P-P with respect to the lower housing component 14.

To minimize the interference between the housing components and tomaximize the relative range of motion, the bolt pad extensions ends thathouse the pivot fastener 22′ have an angled notch at the outer edge ofthe bolt pad extension 16 a, 16 b in the area that defines through hole20. For example, referring to FIGS. 4A and 5A, the bolt pads tapernarrowly at the outer perimeter edge of the housing ends 16 a, 16 b todefine the angled surface 30 a, 30 b. The angled surfaces provide for apreferred notch or gap about the pivot axis P-P through which thehousing components 12, 14 can rotate relative to one another withoutinterference.

In order to facilitate the relative motion between the housingcomponents 12, 14 and closed sealed configuration of the coupling 10about the pipe segments, it is desirable for the relative pivot motionbetween the housing components 12, 14 to occur in a common plane.Accordingly, the preferred coupling assembly 10 provides that relativerotation between the components about an axis YA-YA, YB-YB extendingalong a through hole 20 is minimized or more preferably eliminated. Inthe preferred coupling 10, the pivot fastener 22′ engages the interiorsurface of the bolt pad extension end 16 a, 16 b such that thecomponents cannot rotate relative to one another about an axis YA-YA,YB-YB extending through the through hole 20 of the bolt pad extension 16a, 16 b housing the fastener 22′. In the assembled coupling of FIG. 4Aand as seen in FIG. 5B, the exposed ends of the pin 28 are locatedwithin the recesses 32 a, 32 b formed in the interior surface of thebolt pad extensions 16 a, 16 b which define the through holes 20. Anytendency for the housing components 12, 14 to rotate relative to oneanother is minimized or eliminated by the interaction of the exposedends of the pin 28 and the interior surface defining the recess 32 whichhold the exposed ends of the pin 28.

Shown in FIGS. 6A and 6B are plan and cross-sectional views of apreferred bolt pad extension. In this illustrative example, the bolt padextensions 16 b for lower housing component 14 is being shown, but theopposite bolt pad extension end 18 b can be similarly configured ascould the bolt pad extensions 16 a, 18 a of the upper housing component12. In the plan view of FIG. 6A, the through hole 20 is shown, andproximate the opening to the through hole 20 are the recesses 32 bdiametrically opposed about the opening to engage the exposed ends ofthe pin 28 in the preferred pivot fastener 22′. Shown in thecross-sectional view of FIG. 6B, the recess 32 b defines a partiallysemicircular geometry, although other geometries for the recess 32 bcould be chosen provided the recesses were properly located to at leastpartially house and engage the exposed ends of the pin 28. With regardto the geometry of the through hole 20, cross-sectional area of thethrough hole 20 preferably varies along its axis of elongation B-B ormay alternatively be constant provided that the opening can accommodatethe desired fastener for coupling the housing components 12, 14 and/orprovide their relative pivot motion about the pivot axis P-P. Forexample, as shown in FIG. 6C, is another preferred housing component 14that includes, at both ends 16 b, 18 b through holes 20′ that define anoval geometry to engage a correspondingly shaped portion of a fastenerto prevent the fastener from spinning within through hole 20. Thus, anut can be threaded about the oval shaped fastener with only one hand.

Due to the preferred symmetrical configuration of the housingcomponents, as noted above, the preferred coupling pivot fastener 22 canbe installed on either end 16, 18 of the coupling 10. Moreover, becauseof the preferred common configuration of the housing components, asingle housing component can serve as either the upper housing componentor the lower housing component. Having a single symmetric housingcomponent design may be desirable so as to eliminate the need tomanufacture or inventory additional housing components for the couplingassembly. Additionally, the single housing component design mayeliminate assembly errors by avoiding mismatching and improper assemblyof dissimilar parts that require a specific orientation. The housingcomponents 12, 14 can include additional features to facilitate theirassembly, for example as shown in FIG. 6B. the lower housing component14 may include a tongue 34 b and recess 36 b on each end for matingrespectively with a corresponding recess and tongue in the upperhousing. The tongue and recesses are preferably located radially inwardof the bolt pad through holes 20 relative to the center C of thecoupling 10. Details of the tongue and recess are shown and described inU.S. Pat. No. 6,139,069 which is incorporated by reference in itsentirety.

The preferred use of the pivot fastener can simplify manufacturing ofthe coupling 10. Because the preferred pivot fastener 22′ provides forthe pivot action of the coupling, and thus the precision fit andtolerances are in the pivot fastener, there is no need to machine thecomponent housings 12, 14 to form the hinged connection. Accordingly,the coupling 10 can employ a cast fit between the fastener 22′ and thehousing components 12, 14. As such, the substantial axial alignment orsubstantial perpendicular orientation between components and elements ofthe coupling 10 only requires the components to be sufficiently alignedor oriented perpendicular to one another to provide the desiredconfigurations of the coupling.

Preferably, the coupling 10 is preassembled with the pivot fastener 22installed and the upper and lower housing components 12, 14 coupledtogether. Shown in FIGS. 7A-7B, is a preferred method of joining pipe ortube segments together using the preferred coupling 10. A gasket seal 40is disposed over the ends of the pipe segments 2, 4 as shown in the endview of FIG. 7A (illustratively shown in cross-section in FIGS. 9A and9B). With the fastener 22 preferably in the skewed configuration suchthat the coupling 10 is in the fully open configuration, the lowerhousing component 14 is brought into engagement with the gasket 40 so asto be received within the housing recess defined by the inner surface 14c of the lower housing component 14. The upper housing component 12 ispivoted about the pivot axis P-P, relative to the lower housingcomponent 14 so as to bring the coupling 10 to a closed configurationabout the coupling 40 such that the fastener 22 and the through holes 20in which the fastener is disposed are in the axially alignedconfiguration. In order to fully seal and form the pipe joint, aseparate second fastener 42, a bolt 42 is inserted and disposed withinthe axially aligned through holes 20 of the securement end 18 of thecoupling 10 opposite the coupled end 16. A nut 44 is threaded onto thethreaded shank of the bolt 42 and secured onto the bolt at an amountranging from about thirty to about two hundred-fifty foot-pounds (30-250ft.-lbs) of torque, preferably depending upon the size of the coupling.

Because the preferred coupling is preassembled, the preferred pivotfastener 22′ is secured or partially secured at its ends by threadednuts 29. The nuts 29 are preferably fastened and secured about thethreaded shank portions 26 a, 26 b of the fastener 22′ at amount ofabout 60-100 ft-lbs. of torque or at an amount of torque to provide afastened and secure engagement about the threaded shank portions 26 a,26 b. Alternatively, the ends 26 a, 26 b of the fastener 22′ can besecured to the housing components 12, 14 by other techniques such as bypress fit, staking the ends 26 a, 26 b in place, or using formed endswith other securing structures, i.e. pins, so long as the fastener isproperly secured and located within the through holes 20 of the bolt padextensions 16 a, 16 b and the coupling can satisfy a desired hydrostaticpressure and bending moment rating.

The above described embodiment of coupling 10 was sealed using aseparate fastener 42 that is installed and secured by the end user. Inorder to provide a more preferably fully pre-assembled coupling device,shown in FIGS. 8A & 8B is an alternate embodiment of the coupling 10′.In this alternative embodiment the securement end 18 of the coupling 10′is configured to provide a pre-assembled fastener 42 assembly. Thepre-assembled preferred coupling 10′ still includes at its coupled end16 a fastener 22, preferably pivot fastener 22′ that couples the upperhousing component 12 and lower housing component 14 together andproviding a pivot axis P-P about which the component pivots relative toone another. Although the upper housing component 12 is configured aspreviously described, the lower housing component 14′ preferablyincludes a slot 21 at the securement end 18. The slot 21 is incommunication with through hole 20 of the bolt pad extension end 18 band preferably includes a peripheral slot opening located at the outerlateral edge of the housing component 14′. With the slot opening andslot 21 in the lower housing, a fastener assembly in the form of acombined bolt 42 and nut 44 can be disposed within the through hole 20of the bolt pad extension end 18 a of the upper housing component 12.With the slot 21 in communication with the through hole 20, the bolt padextension 18 b′ provides an elongated or preferably oval shaped openingto engage a correspondingly shaped portion of the bolt to prevent thebolt spinning within the through hole 20.

The pre-assembled coupling 10′ eliminates the need for the end user toinsert a separate bolt in the securement end 18 of the coupling andsecure a nut about the end of the fastener 42. Instead, the end user canlocate the coupling 10′ about the gasket 40 that is disposed about thealigned pipe segments 2, 4. The coupling is then brought to a closedconfiguration as shown for example in FIG. 8B. The fastener assembly 42,44 can be positioned out of the way to allow the housing components topivot to the closed position. Once in the closed configuration, thefastener assembly 42, 44 can be inserted through the slot 21 and itsopening into position in the through hole 20. The nut 44 is thentightened to the desired torque values and the pipe joint can be placedinto service. Although the slot 21 and its peripheral opening aredescribed with respect to the lower housing 14′, it should be understoodthat the alternate housing component 14′ could be used as the upperhousing component of the coupling assembly 10. In such an instance, thefastener assembly 42 can be pre-assembled within the through hole 20 ofthe lower housing component.

The above preferred coupling assemblies are preferably configured forjoining nominal two inch (2 in.); 2½ inch; three inch (3 in.); four inch(4 in.); six inch (6 in.); or eight inch (8 in.) pipe or tubing, but maybe configured to join any size pipe or tubing provided the housingcomponents are configured to hold and secure the pivot fastener 22. Ineach of the preferred coupling assemblies described above, the pivotfastener 22 in combination with the securement fastener 42 providessufficient distributed compression force through the housing componentsabout the gasket 40. The inner surfaces 12 a, 14 a, of the upper andlower housings components 12, 14, which engage the gasket 40, preferablydefine a profile to maximize and/or maintain a sufficient compressiveforce against the gasket so as to maintain an effective seal at the pipejoint.

Shown in FIG. 9A and 9B is a known inner surface 12 a of the upperhousing component 12 engaged with a preferred gasket 40. Details of analternative inner surface 12 a, 14 a and a preferred gasket are shown inthe FIGS. 10A and 10B for use in a hinge coupling arrangement describedabove. Respectively shown in FIGS. 10A and 10B are uncompressed andcompressed views in which a tapering inner surface 12 a of a couplinghousing 12 define a pair of notches 30 which compress lateral sides of apreferred gasket 40 laterally against the interior sidewalls of thehousing 12. Detailed description of the gasket and the housing shown inFIGS. 10A and 10B are provided in International Application No.PCT/US10/53970, filed Oct. 25, 2010, entitled “Systems and Methods forPipe Couplings”, and which claims priority to U.S. Provisional PatentApplication No. 61/255,409, entitled, “System and Methods for PipeCouplings,” filed Oct. 27, 2009, both which are incorporated byreference. Known gasket configurations may be used with the couplingassemblies described herein. For example, as shown in FIGS. 9A and 9B,standard style “C shaped” or “Tri-seal” gaskets as identified at page 12in Tyco Fire & Suppression Products Publication IH-1000FP, entitled,“Grinnell®-Grooved Fire Protection Installation Manual” (August 2007)can be used in the preferred coupling assemblies 10, 10′. A copy of page12 from the installation manual is included in U.S. Provisional PatentApplication No. 61/255,351.

In the preferred coupling 10, 10′ and its installation, as describedabove, the pivot fastener 22 provides at least three functions: i) itcouples the housing components 12, 14 together for a pre-assembly thatminimize the number of separate components for the end user; ii) thefastener 22 defines the pivot axis of the coupling 10; and iii) in theclosed configuration, the fastener 22 provides for a secure hold betweenthe housing components 12, 14 such that the user only has to properlytorque one fastener 42 to form a fluid tight seal. The preferredcoupling assembly 10 more specifically provides for the preferredfastener 22 that, in its axial configuration, linearly aligns thethrough holes 20 of the housing components 12, 14 to define the closedconfiguration of the coupling 10 as seen in FIG. 5B, and in its skewedconfiguration, defines the open configuration of the coupling 10, asseen in FIG. 5A. Shown in FIGS. 3A-3D and described above is a preferredembodiment of pivot fastener 22′. However alternative configurations ofthe fastener 22 and its configuration within the components 12, 14 arepossible provided that the resultant fastener functions as described.For example, the fastener and the coupling could be configured to holdthe coupling in the open and closed configuration with the elements ofthe fastener in a skewed configuration. Additionally, a fastener couldbe provided and the bolt pad extensions configured so as not to requirethe fasteners to extend through a through hole, for example one or moreof the bolt pad could include a threaded blind bore for the shanks ofthe pivot fastener.

While the present invention has been disclosed with reference to certainembodiments, numerous modifications, alterations, and changes to thedescribed embodiments are possible without departing from the sphere andscope of the present invention. Accordingly, it is intended that thepresent invention not be limited to the described embodiments, but thatit has the full scope defined by the language of the following claims,and equivalents thereof.

1. A coupling for coupling two pipe segments together, the couplingcomprising: a first housing component having a first end, a second end,and an arcuate surface extending between the first and second ends ofthe first component; a second housing component having a first end, asecond end, and an arcuate surface extending between the first andsecond ends of the first component, each of the first ends of the firstand second housing components having a through hole; a fastener disposedwithin the through holes of the first ends of the first and secondhousing components so as to couple the first and second components, thefastener having a first element and a second element to define a firstconfiguration and a second configuration of the fastener, the firstconfiguration of the fastener includes the first and second elements ofthe fastener being substantially aligned such that the through holes ofthe first ends of the first and second components are substantiallyaligned so as to define an axis of alignment extending through thethrough holes, the second configuration of the fastener comprises thefirst and second elements being skewed with respect to one another abouta pivot axis that extends substantially perpendicularly to the axis ofalignment.
 2. The coupling of claim 1, wherein the fastener comprises afirst fastener and each of the second ends of the first and secondhousing components have a through hole, the coupling further comprisinga second fastener disposed within at least one of the through holes ofthe second ends of the first and second components.
 3. The coupling ofclaim 2, wherein the first fastener is in the first configuration, thearcuate surfaces of the first and second components are opposed oneanother to define a central axis of the coupling that extends parallelto the pivot axis.
 4. The coupling of claim 3, wherein the through holesof the second ends of the first and second housing components aresubstantially axially aligned substantially parallel to the axis ofalignment of the through holes at the first ends of the first and secondhousing components.
 5. The coupling of claim 3, wherein the secondfastener is disposed within each of the through holes at the second endsof the housing components such that the first fastener is secured in thefirst configuration.
 6. The coupling of claim 3, wherein the second endof one of the first and second housing components defines a slotextending toward the central axis of the coupling and in communicationwith the through hole of the second end of the one housing components.7. The coupling of claim 2, wherein the second fastener is disposed inonly one through hole at the second end of one of the first and secondhousing components so that the first fastener moves between the firstand second configuration and the first and second housing componentspivot with respect to one another about the pivot axis.
 8. The couplingof claim 1, wherein the first end of at least one of the first andsecond housing components includes an interior surface defining thethrough hole of the first end of the at least one component, theinterior surface engaging a portion of the fastener so as to preventrelative rotation between the first and second components about thelinear axis.
 9. The coupling of claim 8, wherein the fastener includes apin disposed along the pivot axis and which couples the first element tothe second element.
 10. The coupling of claim 9, wherein the pin is theportion of the fastener engaged by the interior surface of the first endof the at least one component, the interior surface defining a recessfor housing the pin.
 11. The coupling of claim 1, wherein each of thefirst and second elements of the fastener has an enlarged head portionand a shank portion depending from the head portion along a longitudinalaxis of the element that extends perpendicular to the pivot axis of thefastener; the head portion of each of the first and second elementsincluding a through hole extending along the pivot axis, a pin disposedin the through holes of each head portion of the fastener to couple thefirst element to the second element such that the head portions of thefirst and second elements engage one another.
 12. The coupling of claim11, wherein the first configuration the longitudinal axes of the firstand second elements are coaxially aligned along the linear axis suchthat the shank portions of the first and second elements define opposedaxial ends of the fastener.
 13. The coupling of claim 11, wherein thehead portion of the first element includes a first planar engagementsurface, the head portion of the second element including a secondplanar engagement surface, first and second planar engagement surfacesengaging one another.
 14. The coupling of claim 13, wherein the headportion of the first element includes a first planar shoulder extendingperpendicular to the first planar engagement surface, and whereinfurther the head portion of the second element includes a secondshoulder extending perpendicular to the second planar engagementsurface.
 15. The coupling of claim 11, wherein the shank portion of eachof the first and second elements is threaded, each threaded portionbeing positioned within one of the through holes at the first ends ofthe housing components by a nut threaded about the threaded portion. 16.A method of assembling a pipe coupling comprising: pivoting about apivot axis a first fastener element disposed in a first end of a firsthousing component of the coupling relative to a second fastener elementdisposed in a first end of a second housing component of the couplingsuch that the first and second elements are disposed along a linear axisthat is substantially perpendicular to the pivot axis so to bringinterior surfaces of the first and second housing components opposed toone another to define a central axis of the coupling that runssubstantially parallel to the pivot axis; and securing a second end ofthe first housing component to the second end of the second housingcomponent.
 17. The method of claim 16, wherein the securing includesinserting a fastener secured to the second end of one of the first andsecond housing components through a slot in the second end of the otherof the first and second housing components, and securing the bolt in athrough hole of the component having the slot, the slot being incommunication with the through hole.
 18. A coupling for coupling pipesegments, the coupling comprising: a first housing component; a secondhousing component; a fastener coupling the first and second componentstogether, the fastener has a first element and a second element definingan aligned configuration including an axis of alignment such that firstand second housing components are in a closed configuration so as todefine a central axis of the coupling, the first and second elements ofthe fastener having a skewed configuration to define a pivot axis of thefastener such that the first and second housing components are in anopen configuration, the pivot axis being parallel to the central axisand perpendicular to the axis of alignment.
 19. The coupling of claim18, wherein the fastener prevents relative rotation between the firstand second housing components about the axis of alignment.
 20. Acoupling for coupling pipe segments, the coupling comprising: a firsthousing component having a first through hole; a second housingcomponent having a second through hole; a fastener having a firstfastener element engaged with the first housing component and a secondfastener element engaged with the second housing component, the fastenercoupling the first and second components together so that the first andsecond housing components pivot with respect to one another, thefastener having a cast fit within the through holes.
 21. The coupling ofclaim 20, wherein the first and second housings are cast.
 22. A couplingfor coupling pipe segments, the coupling comprising: a first housingcomponent; a second housing component, the first and second housingcomponents having an open configuration and a closed configuration todefine a central axis of the coupling; and a fastener coupling the firstand second components together, the fastener having a first elementengaged with the first housing component along a first engagement axisand a second element engaged with the second housing component along asecond engagement axis, the first element being coupled to the secondelement such that the first and second elements of the fastener pivotwith respect to one another about a pivot axis that is perpendicular toa plane that includes at least one of the first and second engagementaxes, the pivot axis being parallel to the central axis of the couplingand defining the pivot axis about which the first and second housingcomponents pivot relative to one another between the open and closedconfiguration.
 23. The coupling of claim 22, wherein the first elementof the fastener engages a first recess in the first housing componentand the second element of the fastener engages a second recess in thesecond housing component.
 24. The coupling of claim 23, wherein thefirst and second recesses are blind bores.
 25. The coupling of claim 24,wherein the first and second recesses are through holes.
 26. Thecoupling of claim 24 or 25, wherein first and second recesses arethreaded.
 27. The coupling of claim 23, wherein the closed configurationthe first and second recesses are axially aligned.
 28. A fastener toprovide a pivot coupling between two components, the fastenercomprising: a first element and a second element, each of the first andsecond elements having an enlarged head portion and a shank portiondepending from the head portion along a longitudinal axis, the headportion of each of the first and second elements being engaged with oneanother such that the shank portion of the first and the shank portionof the second element pivot with respect to one another about a pivotaxis.
 29. The fastener of claim 28, wherein the head portion of each ofthe first and second elements include a through hole and the fastenerfurther comprises a pin disposed in the through hole of each headportion of the fastener to couple the first element to the secondelement and define the pivot axis about which the head portions of thefirst and second elements pivot with respect to one another.
 30. Thefastener of claim 28, wherein the first and second elements define aconfiguration wherein the shank portions of the first and secondelements define opposed axial ends of the fastener.
 31. The fastener ofclaim 28, wherein the head portion of the first element includes a firstplanar engagement surface, the head portion of the second elementincludes a second planar engagement surface, first and second planarengagement surfaces engaging one another.
 32. The fastener of claim 31,wherein the head portion of the first element includes a first planarshoulder extending perpendicular to the first planar engagement surface,and wherein further the head portion of the second element includes asecond shoulder extending perpendicular to the second planar engagementsurface.
 33. The fastener of claim 28, wherein the shank portion of eachof the first and second elements is threaded.